If they don't, you get a treasure artifact token that you can tap and sacrifice for a mana of any color
So, the spell goes into its owners graveyard and they still pay the mana cost for casting it
Not only is Volrath capable of 1-shotting opponents with ease, but he also isn't all-in on Voltron as the haymakers he's discarding can then be reanimated to finish up games
The fact that you can mutate Illuna on top of some cheap creature (perhaps a creature with hexproof?) and gain a 6/6 flying trample body as well as a free permanent on the battlefield for just five mana makes this one of the most obviously powerful cards in the set
Sure, Consulting for Channel would cause them to lose on the spot around 12% of the time (i.e, whenever Channel was one of the top six cards)
In terms of your chance of pulling one of these, it can vary depending on the set